operational with OS 5

Revision:
60:fda7696090e1
Parent:
59:4c739d732e0d
Child:
61:fdd51bb3a950
--- a/mbed-os.lib	Tue Feb 13 17:00:02 2018 +0000
+++ b/mbed-os.lib	Mon Feb 26 13:30:02 2018 +0000
@@ -1,1 +1,1 @@
-https://github.com/ARMmbed/mbed-os/#569159b784f70feaa32ce226aaca896fb83452f7
+https://github.com/ARMmbed/mbed-os/#91e6db1ea251ffcc973001ed90477f42fdca5751